Have the scale calibrated

Whether a scale must be calibrated depends on its intended use. Measurement and calibration laws do not apply across the board to “commercial” use, but rather to the purpose for which the measurement value is used. As soon as the result of a weighing is used in billing, pricing, or other fee calculations involving a third party, it falls within a regulated scope of use.

The only use exempt from the calibration requirement is purely internal use within the company. This includes, for example, internal inventory checks, production controls, comparisons of incoming goods, or technical process monitoring—provided that the respective result is not later used as the basis for an external claim.

For operational assessment, therefore, a simple guiding question suffices: Which scale ultimately provides the exact value on the basis of which a customer, client, or contractual partner is to pay? This specific scale is the relevant point of reference for the assessment under calibration law.

Classification should be device-specific. Consequently, a business may have multiple scales in use simultaneously, only some of which are subject to legal metrology requirements. The decisive factor is always the function of the individual measured value within the respective process.

For borderline cases, a case matrix is usually more helpful than simply reiterating general principles. It shows at which specific points companies must calibrate a scale and when they do not:

• Shipping costs based on a rate tier rather than an exact price per kilogram: The weight remains relevant for billing, even if only one shipping class is triggered. Result: Calibration required.
• Internal preliminary weighing, followed by final weighing for billing or freight charges: Only the scale used to determine the binding billing value is relevant. Result: Preliminary weighing—no; final weighing—yes.
• Measurement value is stored and invoiced only later: The time lag in invoicing does not change the legal nature of the transaction. Result: Calibration required.
• Service provider determines weight for the client, who then issues an invoice: The decisive factor is the subsequent use of the measured value in external transactions. Result: subject to calibration.
• Goods receipt solely for inventory or quality control purposes: The value remains within the company and does not trigger a receivable. Result: Not subject to calibration.
• The goods receipt value is later used for credit memos, complaints, or charges against suppliers: In this case, the same data record has an economic impact externally. Result: Generally subject to calibration.
• A device is used alternately for internal purposes and for billing purposes: For regulated use, this specific device must meet the legal metrology requirements. Result: subject to legal metrology requirements for the relevant use.

This also answers the common practical question of whether multiple scales at a single location should be treated differently: yes, if only some of the devices provide measurement values for price, postage, or freight to third parties.

In brick-and-mortar retail, the calibration requirement is generally clear because the measured value is directly factored into the purchase price. In addition, Section 23(3) of the Measurement and Calibration Ordinance (MessEV) stipulates that measuring instruments falling within the scope of the Measurement and Calibration Act must be set up and used in such a way that the buyer can observe the measurement process.

For store scales, therefore, it is not only the valid calibration that matters, but also the transparent execution of the actual sales transaction.

For logistics service providers, the unique aspect often lies in third-party billing. The weight is not always billed by the party performing the measurement itself, but is instead passed on to the shipper, carrier, or billing partner. This is irrelevant for legal classification as long as this exact value serves as the basis for the subsequent determination of fees.

Transparent process documentation is particularly important here: Companies should clearly document which measurement point is used to calculate the tariff-based or contractual charge.

In mail-order business, the legally decisive factor is often not the kilogram itself, but the threshold that triggers a shipping rate. Even if a store system only uses shipping tiers such as “up to 5 kg” or “up to 10 kg,” the pricing logic is based on a measured value. That is precisely why this scale must be suitable for regulated use.

Anyone who invoices shipments or passes on freight costs on this basis therefore needs not just any package scale, but a solution that is approved for this purpose. Technically, this often leads to the selection of a calibrated package scale.

When it comes to goods receipts, the key issue is the change in the purpose of the data record. As long as a weighing is used solely for internal verification of delivery quantities, inventory levels, or quality deviations, it is not subject to calibration requirements.

The same process takes on a different legal status if the recorded weight is later used as evidence for a reduction, additional charge, or credit note issued to the supplier. Companies should therefore consider not only the “goods receipt” workstation but also how the stored weight will be used subsequently.

During ongoing operation, the main focus is on managing changes. Relocating the equipment to an unsuitable surface, connecting additional components, performing repairs on load-bearing parts, or making software modifications can affect the equipment’s continued lawful use.

Companies should therefore document every technical change and, before reusing the equipment in a regulated environment, verify whether additional steps are required.

According to Section 17 of the MessEV, the information required to accompany the measuring instrument must be available. Depending on the instrument, this may include operating instructions, manufacturer’s documentation, conformity information, and other instrument-specific details.

In practice, it is helpful to maintain a device-specific filing system—whether digital or physical—so that documents are readily available during internal audits, maintenance, or regulatory inspections without the need for a time-consuming search.

According to Section 32 of the German Measurement Act (MessEG), the commissioning of a new measuring instrument subject to calibration—or one being used for the first time—must be reported to the competent calibration authority within six weeks. The decisive factor is the start of actual use, not merely the order, delivery, or storage of the instrument.

For practical purposes, it is therefore important to establish clear internal responsibilities: The person who sets up the scale should document the start date and not defer the notification to a later administrative process. The notification can be prepared centrally via eichamt.de.

The authority does not automatically monitor every single deadline for the user. Companies should therefore maintain their own deadline register, ideally including the equipment type, location, deadline, and responsible contact person. The user is responsible for submitting the application for re-verification in a timely manner before the deadline expires.

Planning ahead is particularly important for companies with multiple branches or shipping locations that experience high seasonal volume. This helps prevent scheduling bottlenecks and unplanned downtime in operations relevant to billing.

Whether a scale is inspected at the site of use or at the calibration office depends primarily on its design, size, and portability. Small, portable devices are more likely to be brought in for inspection; stationary or difficult-to-move systems are typically considered for on-site inspection.

For companies, this distinction is also relevant from an organizational standpoint, as it can result in varying costs associated with transportation, downtime, and scheduling.

If the inspection is successful, the valid calibration is indicated on the device in the prescribed form, typically by means of a calibration mark or a sticker. This mark should then be protected and must not be damaged, removed, or rendered illegible during normal operation.

If the inspection is not passed, the scale may not simply continue to be used for the corresponding regulated application. In such cases, the identified defects or deviations must first be addressed.

The application is submitted by the user, not automatically by the manufacturer, dealer, or service provider. The competent authority is generally the calibration authority of the federal state in which the device is used.

For stationary large-capacity scales, chain stores, or centrally procured devices, it should be clearly defined internally who is actually responsible for initiating the application. Unclear responsibility is a common cause of delays in the process.

Before the appointment, the scale should be in working order, easily accessible, and in good condition. The relevant documentation should also be readily available. For built-in or hard-to-access systems, it should be determined in advance whether additional organizational measures are necessary.

Practical errors often arise because equipment has not yet been fully installed, connection components are missing, or the test area is unavailable at the time of the appointment. Such issues can usually be avoided through advance coordination.

Anyone searching for “scale calibration costs” will rarely find a uniform answer across the country. There is a legal reason for this: According to Section 59 of the German Measurement Act (MessEG), fees are governed by state law. As a result, the same type of scale may be priced differently depending on the state and the specific calibration scenario.

The following factors are particularly relevant to how fees are determined:

• State and its applicable fee regulations
• Type of scale, such as a non-automatic scale, checkweigher, or special design
• Maximum capacity and size
• Inspection location, i.e., calibration office or on-site visit
• Number of devices to be inspected during the same visit
• Additional effort required for stationary systems, difficult access, or special testing conditions

It is important to manage expectations realistically: Even for similar devices, costs can vary significantly if one device is demonstrated while the other can only be tested at the site of use. Reliable information can therefore be obtained from the fee schedule of the relevant state calibration authority or by submitting a specific inquiry for each individual case.

These three terms refer to different legal and technical processes:

• Calibration: a legally regulated test within a regulated scope of use; relevant for scales when the measured value is used for billing purposes.
• Conformity assessment: A procedure conducted before a new measuring instrument is placed on the market; for new instruments, it replaces the former initial verification.
• Calibration: Voluntary determination and documentation of measurement deviation, for example, for quality management or audit purposes.

The most important practical rule is: Calibration does not replace verification. Even a DAkkS calibration certificate does not fulfill the legal function of verification when a scale is used in a regulated area.

Similarly, conformity assessment must not be confused with subsequent re-verification. The former concerns the placing on the market of a new device, while the latter concerns its continued lawful use in operation after the initial period has expired.

A calibrated scale covers only the portion of the billing that is based on weight. As soon as the pricing logic also takes external dimensions into account, the basis for calculation comes from two different measurement processes.

This is precisely why, in volume-weight-based shipping models, measuring mass alone is not sufficient. For combined applications, a volumetric scale may be the appropriate technical solution, provided that the system used meets the relevant requirements.

For dimension data relevant to billing, not just any camera or scanning application is sufficient; rather, a system that has been legally approved as a measuring instrument for this purpose is required. The relevant standard is MID Annex MI-009.

In addition to the actual measurement, the assignment of each individual measurement to a specific shipping transaction is practically crucial. Therefore, the documentable traceability of the measurement process plays a central role in such systems.

If weight is the only factor considered for postage, freight, or cost allocation, the system selection should focus on a legally compliant and process-appropriate method of weight determination. PackageHERO® offers a compact introduction to this use case on its page for calibrated package scales.

If shipping rates also depend on package dimensions, a standard weight scale alone is not sufficient. PackageHERO® offers a compact introduction to this system on its "Volume Scale" page.